/usr/share/gocode/src/github.com/emicklei/go-restful/examples/restful-filters.go is in golang-github-emicklei-go-restful-dev 1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"github.com/emicklei/go-restful"
"log"
"net/http"
"time"
)
type User struct {
Id, Name string
}
type UserList struct {
Users []User
}
// This example show how to create and use the three different Filters (Container,WebService and Route)
// When applied to the restful.DefaultContainer, we refer to them as a global filter.
//
// GET http://locahost:8080/users/42
// and see the logging per filter (try repeating this request)
func main() {
// install a global (=DefaultContainer) filter (processed before any webservice in the DefaultContainer)
restful.Filter(globalLogging)
restful.Add(NewUserService())
log.Printf("start listening on localhost:8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}
func NewUserService() *restful.WebService {
ws := new(restful.WebService)
ws.
Path("/users").
Consumes(restful.MIME_XML, restful.MIME_JSON).
Produces(restful.MIME_JSON, restful.MIME_XML)
// install a webservice filter (processed before any route)
ws.Filter(webserviceLogging).Filter(measureTime)
// install a counter filter
ws.Route(ws.GET("").Filter(NewCountFilter().routeCounter).To(getAllUsers))
// install 2 chained route filters (processed before calling findUser)
ws.Route(ws.GET("/{user-id}").Filter(routeLogging).Filter(NewCountFilter().routeCounter).To(findUser))
return ws
}
// Global Filter
func globalLogging(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
log.Printf("[global-filter (logger)] %s,%s\n", req.Request.Method, req.Request.URL)
chain.ProcessFilter(req, resp)
}
// WebService Filter
func webserviceLogging(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
log.Printf("[webservice-filter (logger)] %s,%s\n", req.Request.Method, req.Request.URL)
chain.ProcessFilter(req, resp)
}
// WebService (post-process) Filter (as a struct that defines a FilterFunction)
func measureTime(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
now := time.Now()
chain.ProcessFilter(req, resp)
log.Printf("[webservice-filter (timer)] %v\n", time.Now().Sub(now))
}
// Route Filter (defines FilterFunction)
func routeLogging(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
log.Printf("[route-filter (logger)] %s,%s\n", req.Request.Method, req.Request.URL)
chain.ProcessFilter(req, resp)
}
// Route Filter (as a struct that defines a FilterFunction)
// CountFilter implements a FilterFunction for counting requests.
type CountFilter struct {
count int
counter chan int // for go-routine safe count increments
}
// NewCountFilter creates and initializes a new CountFilter.
func NewCountFilter() *CountFilter {
c := new(CountFilter)
c.counter = make(chan int)
go func() {
for {
c.count += <-c.counter
}
}()
return c
}
// routeCounter increments the count of the filter (through a channel)
func (c *CountFilter) routeCounter(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
c.counter <- 1
log.Printf("[route-filter (counter)] count:%d", c.count)
chain.ProcessFilter(req, resp)
}
// GET http://localhost:8080/users
//
func getAllUsers(request *restful.Request, response *restful.Response) {
log.Printf("getAllUsers")
response.WriteEntity(UserList{[]User{User{"42", "Gandalf"}, User{"3.14", "Pi"}}})
}
// GET http://localhost:8080/users/42
//
func findUser(request *restful.Request, response *restful.Response) {
log.Printf("findUser")
response.WriteEntity(User{"42", "Gandalf"})
}
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